Tag responsive to high frequency for varying capacitance of capa

Communications: electrical – Continuously variable indicating – With meter reading

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Details

340571, 342 42, 257312, H04G 522, G08B 1314, G01S 1374, H01L 27108

Patent

active

057215359

ABSTRACT:
The outputted voltage of a rectifier 3 is detected by a voltage detector circuit 17. When the detected voltage value is low (received radio wave is weak, distance is long), a controller 20 turns off a switch 16 to connect only a capacitor 14 to the output of the rectifier 3, so that the capacitances of the capacitors are decreased and the build up of a power voltage is accelerated. On the other hand, when the detected voltage value is higher than a prescribed level (received radio wave is powerful, distance is short), the controller 20 turns on the switch 16 to connect capacitors 14, 15 in parallel with the output of the rectifier 3, so that the capacitances of the capacitors are increased and a ripple is fully removed. Thus, communications can be made while preventing a malfunction due to the ripple.

REFERENCES:
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5287113 (1994-02-01), Meier
patent: 5410315 (1995-04-01), Huber
patent: 5499017 (1996-03-01), Beigel

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